The solar energy resources in China are rich, the annual radiation time of about two thirds land exceeds 2,200 hours, and the total annual radiation exceeds 5,000 MJ/m2. The annual solar energy irradiating to the vast areas in our country equals to over 2,000 times[9] as much as the annually total energies offered by such conventional energy sources as coals, petroleum, natural gas and various firewoods at present. Though the solar energy is low in density and affected by the weather and seasons to a great extent, the current technologies can completely reduce the influence on the application, E.g. development of equipment for heat accumulation and storage, use of efficient collector, and applications of waste-heat recovery technology, geothermal technology, heat-pump technology and heat-pipe technology can reduce the defect in this aspect, providing the technical and equipment support for drying of solar agricultural products.